package springbootautoconfiguration.demo2;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.boot.context.properties.EnableConfigurationProperties;

import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ApplicationEventMulticaster;
import org.springframework.context.event.SimpleApplicationEventMulticaster;
import org.springframework.context.support.AbstractApplicationContext;
import org.springframework.core.env.Environment;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;


@Configuration
@EnableConfigurationProperties(CustomProperties.class)
public class Lab2AutoConfig {

    /**
     * 在spring boot中有时候需要控制配置类是否生效,
     * 可以使用@ConditionalOnProperty注解来控制@Configuration是否生效.
     * prefix为配置文件中的前缀,
     * name为配置的名字
     * havingValue是与配置的值对比值,当两个值相同返回true,配置类生效.
     */
    @Bean
    @ConditionalOnProperty(prefix = "grey.auto", name = "enable", havingValue = "true")
    CommandLineRunner createCustomCommandLineRunner(Environment env){
        return new CustomCommandLineRunner(env);
    }


    /**
     * 自定义事件发布器
     *
     */
    @Bean(AbstractApplicationContext.APPLICATION_EVENT_MULTICASTER_BEAN_NAME)
    ApplicationEventMulticaster customApplicationEventMulticaster(ThreadPoolTaskExecutor taskExecutor) {
        SimpleApplicationEventMulticaster eventMulticaster = new SimpleApplicationEventMulticaster();
        eventMulticaster.setTaskExecutor(taskExecutor);
        return eventMulticaster;
    }


    /**
     * 自定义事件
     */
    static class NoticeEvent extends ApplicationEvent {

        private static final Logger logger = LoggerFactory.getLogger(NoticeEvent.class);

        /**
         * 存储信息
         */
        private final String message;

        public NoticeEvent(String message) {
            super(message);
            this.message = message;
            logger.info("添加事件成功! message: {}", message);
        }

        public String getMessage() {
            return message;
        }
    }


    /**
     * 自定义事件监听器，监听{@link NoticeEvent}事件
     */
    @Component
    static class NoticeListener implements ApplicationListener<NoticeEvent> {

        private static final Logger logger = LoggerFactory.getLogger(NoticeListener.class);

        @Override
        public void onApplicationEvent(NoticeEvent noticeEvent) {
            logger.info("事件监听获取到NoticeEvent，睡眠当前线程 2 秒...");
            try {
                Thread.sleep(2000);
            }catch (InterruptedException e) {
                e.printStackTrace();
            }
            logger.info("NoticeEvent 的 message 属性是 : {}", noticeEvent.getMessage());

        }
    }


    /**
     * 自定义事件监听器
     */
    @Bean
    public ApplicationListener<ApplicationReadyEvent> listener(){

        return new ApplicationListener<ApplicationReadyEvent>() {
            @Override
            public void onApplicationEvent(ApplicationReadyEvent event) {
                System.out.printf("自定义ApplicationReadyEvent 事件监听器！");
            }
        };
    }
}
